LMSW - Load Machine Status Word (286+ privileged)

        Usage:  LMSW    src
        Modifies flags: None

        Loads the Machine Status Word (MSW) from data found at src

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg16             -     3     10    13            3
        mem16             -     6     13    13            5


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